The Raid, the French police force's specialist intervention unit, is taking part in a simulation of a terror attack to prepare for the worst case scenario at the Olympic Games this summer. It comes after the government raised its terror alert warning to its highest level following the recent attack on a Moscow concert hall claimed by the Islamic State group. France 24's Kethevane Gorjestani takes a look at the measures being taken in response to the current security threats facing the country.
